/**
 * @class Ext.ux.LiveSearchGridPanel
 * @extends Ext.grid.Panel
 * <p>A GridPanel class with live search support.</p>
 * @author Nicolas Ferrero
 */
Ext.define('Ext.ux.LiveSearchGridPanel', {
    extend: 'Ext.grid.Panel',
    requires: [
        'Ext.toolbar.TextItem',
        'Ext.form.field.Checkbox',
        'Ext.form.field.Text',
        'Ext.ux.statusbar.StatusBar'
    ],

    /**
     * @private
     * search value initialization
     */
    searchValue: null,

    /**
     * @private
     * The row indexes where matching strings are found. (used by previous and next buttons)
     */
    indexes: [],

    /**
     * @private
     * The row index of the first search, it could change if next or previous buttons are used.
     */
    currentIndex: null,

    /**
     * @private
     * The generated regular expression used for searching.
     */
    searchRegExp: null,

    /**
     * @private
     * Case sensitive mode.
     */
    caseSensitive: false,

    /**
     * @private
     * Regular expression mode.
     */
    regExpMode: false,

    /**
     * @cfg {String} matchCls
     * The matched string css classe.
     */
    matchCls: 'x-livesearch-match',

    defaultStatusText: 'Nothing Found',

    // Component initialization override: adds the top and bottom toolbars and setup headers renderer.
    initComponent: function () {
        var me = this;
        me.tbar = ['Search', {
            xtype: 'textfield',
            name: 'searchField',
            hideLabel: true,
            width: 200,
            listeners: {
                change: {
                    fn: me.onTextFieldChange,
                    scope: this,
                    buffer: 100
                }
            }
        }, {
            xtype: 'button',
            text: '<',
            tooltip: 'Find Previous Row',
            handler: me.onPreviousClick,
            scope: me
        }, {
            xtype: 'button',
            text: '>',
            tooltip: 'Find Next Row',
            handler: me.onNextClick,
            scope: me
        }, '-', {
            xtype: 'checkbox',
            hideLabel: true,
            margin: '0 0 0 4px',
            handler: me.regExpToggle,
            scope: me
        }, 'Regular expression', {
            xtype: 'checkbox',
            hideLabel: true,
            margin: '0 0 0 4px',
            handler: me.caseSensitiveToggle,
            scope: me
        }, 'Case sensitive'];

        me.bbar = Ext.create('Ext.ux.StatusBar', {
            defaultText: me.defaultStatusText,
            name: 'searchStatusBar'
        });

        me.callParent(arguments);
    },

    // afterRender override: it adds textfield and statusbar reference and start monitoring keydown events in textfield input 
    afterRender: function () {
        var me = this;
        me.callParent(arguments);
        me.textField = me.down('textfield[name=searchField]');
        me.statusBar = me.down('statusbar[name=searchStatusBar]');
    },
    // detects html tag
    tagsRe: /<[^>]*>/gm,

    // DEL ASCII code
    tagsProtect: '\x0f',

    // detects regexp reserved word
    regExpProtect: /\\|\/|\+|\\|\.|\[|\]|\{|\}|\?|\$|\*|\^|\|/gm,

    /**
     * In normal mode it returns the value with protected regexp characters.
     * In regular expression mode it returns the raw value except if the regexp is invalid.
     * @return {String} The value to process or null if the textfield value is blank or invalid.
     * @private
     */
    getSearchValue: function () {
        var me = this,
            value = me.textField.getValue();

        if (value === '') {
            return null;
        }
        if (!me.regExpMode) {
            value = value.replace(me.regExpProtect, function (m) {
                return '\\' + m;
            });
        } else {
            try {
                new RegExp(value);
            } catch (error) {
                me.statusBar.setStatus({
                    text: error.message,
                    iconCls: 'x-status-error'
                });
                return null;
            }
            // this is stupid
            if (value === '^' || value === '$') {
                return null;
            }
        }

        var length = value.length,
            resultArray = [me.tagsProtect + '*'],
            i = 0,
            c;

        for (; i < length; i++) {
            c = value.charAt(i);
            resultArray.push(c);
            if (c !== '\\') {
                resultArray.push(me.tagsProtect + '*');
            }
        }
        return resultArray.join('');
    },

    /**
     * Finds all strings that matches the searched value in each grid cells.
     * @private
     */
    onTextFieldChange: function () {
        var me = this,
            count = 0;

        me.view.refresh();
        // reset the statusbar
        me.statusBar.setStatus({
            text: me.defaultStatusText,
            iconCls: ''
        });

        me.searchValue = me.getSearchValue();
        me.indexes = [];
        me.currentIndex = null;

        if (me.searchValue !== null) {
            me.searchRegExp = new RegExp(me.searchValue, 'g' + (me.caseSensitive ? '' : 'i'));


            me.store.each(function (record, idx) {
                var td = Ext.fly(me.view.getNode(idx)).down('td'),
                    cell, matches, cellHTML;
                while (td) {
                    cell = td.down('.x-grid-cell-inner');
                    matches = cell.dom.innerHTML.match(me.tagsRe);
                    cellHTML = cell.dom.innerHTML.replace(me.tagsRe, me.tagsProtect);

                    // populate indexes array, set currentIndex, and replace wrap matched string in a span
                    cellHTML = cellHTML.replace(me.searchRegExp, function (m) {
                        count += 1;
                        if (Ext.Array.indexOf(me.indexes, idx) === -1) {
                            me.indexes.push(idx);
                        }
                        if (me.currentIndex === null) {
                            me.currentIndex = idx;
                        }
                        return '<span class="' + me.matchCls + '">' + m + '</span>';
                    });
                    // restore protected tags
                    Ext.each(matches, function (match) {
                        cellHTML = cellHTML.replace(me.tagsProtect, match);
                    });
                    // update cell html
                    cell.dom.innerHTML = cellHTML;
                    td = td.next();
                }
            }, me);

            // results found
            if (me.currentIndex !== null) {
                me.getSelectionModel().select(me.currentIndex);
                me.statusBar.setStatus({
                    text: count + ' matche(s) found.',
                    iconCls: 'x-status-valid'
                });
            }
        }

        // no results found
        if (me.currentIndex === null) {
            me.getSelectionModel().deselectAll();
        }

        // force textfield focus
        me.textField.focus();
    },

    /**
     * Selects the previous row containing a match.
     * @private
     */
    onPreviousClick: function () {
        var me = this,
            idx;

        if ((idx = Ext.Array.indexOf(me.indexes, me.currentIndex)) !== -1) {
            me.currentIndex = me.indexes[idx - 1] || me.indexes[me.indexes.length - 1];
            me.getSelectionModel().select(me.currentIndex);
        }
    },

    /**
     * Selects the next row containing a match.
     * @private
     */
    onNextClick: function () {
        var me = this,
            idx;

        if ((idx = Ext.Array.indexOf(me.indexes, me.currentIndex)) !== -1) {
            me.currentIndex = me.indexes[idx + 1] || me.indexes[0];
            me.getSelectionModel().select(me.currentIndex);
        }
    },

    /**
     * Switch to case sensitive mode.
     * @private
     */
    caseSensitiveToggle: function (checkbox, checked) {
        this.caseSensitive = checked;
        this.onTextFieldChange();
    },

    /**
     * Switch to regular expression mode
     * @private
     */
    regExpToggle: function (checkbox, checked) {
        this.regExpMode = checked;
        this.onTextFieldChange();
    }
});